{"product_id":"allen-bradley-1785-mj-plc-memory-module","title":"Allen-Bradley 1785-MJ PLC Memory Module","description":"\u003cp\u003eThe \u003cstrong\u003e1785-MJ\u003c\/strong\u003e is an Allen-Bradley EEPROM memory module with an 8K-word memory capacity, specified for use with PLC-5\/15, PLC-5\/25, and PLC-2\/17 programmable logic controllers. It provides non-volatile memory storage for controller program data, making it a replacement memory component for supported legacy PLC systems. The manufacturer has discontinued this module.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eMemory Configuration\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe 1785-MJ uses EEPROM (Electrically Erasable Programmable Read-Only Memory) technology. Unlike volatile memory, EEPROM retains stored data without continuous power, allowing the stored program information to remain available when the controller is powered down.\u003c\/p\u003e\n\u003cp\u003eIts 8K memory capacity is intended for the specified PLC processor configurations. The supplied information does not identify the memory word width or detailed programming and retention specifications.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProcessor Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe supplied product description identifies the following compatible controller models:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAllen-Bradley PLC-5\/15\u003c\/li\u003e\n\u003cli\u003eAllen-Bradley PLC-5\/25\u003c\/li\u003e\n\u003cli\u003eAllen-Bradley PLC-2\/17\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThese processor designations are important when selecting a replacement module. Compatibility should be checked against the installed controller and its existing memory configuration rather than assumed across the entire PLC-5 or PLC-2 product families.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1785-MJ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003ePLC Memory Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory Capacity\u003c\/td\u003e\n\u003ctd\u003e8K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory Technology\u003c\/td\u003e\n\u003ctd\u003eEEPROM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Processors\u003c\/td\u003e\n\u003ctd\u003ePLC-5\/15, PLC-5\/25, PLC-2\/17\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.05 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Status\u003c\/td\u003e\n\u003ctd\u003eDiscontinued\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct Status and Warranty\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley 1785-MJ is discontinued by the manufacturer. The supplied product listing states that the original factory warranty does not apply and includes a \u003cstrong\u003eRadwell 2-year warranty\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eFor replacement applications, verify the existing memory module designation and controller model before ordering. The EEPROM memory technology distinguishes this module from memory modules using other storage technologies.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which PLC processors are compatible with the 1785-MJ?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The supplied specifications list PLC-5\/15, PLC-5\/25, and PLC-2\/17 processors. Compatibility with other processor models is not established by the available information.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between EEPROM and CMOS memory?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: EEPROM is non-volatile memory that retains stored information without continuous power. CMOS alone does not establish non-volatile data retention, so the 1785-MJ should not be treated as interchangeable with a CMOS memory module solely because both have an 8K capacity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the Allen-Bradley 1785-MJ still manufactured?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No. The manufacturer has discontinued the 1785-MJ. The supplied listing specifies a Radwell 2-year warranty rather than the original factory warranty.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":53270331228440,"sku":"1785-MJ","price":270.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/1785-MJ2_Cocoai_41e7969a-33a6-46df-9a47-d57a2df400c1.jpg?v=1794534320","url":"https:\/\/www.innoplcsync.com\/products\/allen-bradley-1785-mj-plc-memory-module","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}